<root> (root node) represents the root node of a tree.
Attributes:
label gives a label for a root node.
Datatype: CDATA
Values: A character string.
Default: #IMPLIED
value provides the value of the root, which is a feature structure or other analytic element.
Datatype: IDREF
Values: A valid identifier of a feature structure or other analytic element.
Default: #IMPLIED
children provides a list of IDs of the elements which are the children of the root node.
Datatype: IDREFS
Values: A list of valid identifiers.
Default: #IMPLIED
Note

If the root has no children (i.e., the tree is `trivial'), then the children attribute must be omitted. For technical reasons, it cannot be specified as <root children=''> .

ord indicates whether or not the root is ordered.
Datatype: (Y | N)
Legal values:
Y indicates that the children of the root are ordered.
N indicates that the children of the root are unordered.
Default: #IMPLIED
Note

Use if and only if ord=partial is specified on the <tree> tag and the root has more than one child.

outDegree gives the out degree of the root, the number of its children.
Datatype: NUMBER
Values: A nonnegative integer.
Default: #IMPLIED
Note

The in degree of the root is always 0.

Example 
<root id=VP1 label=VP children='VB1 PN1' outDegree=2>
Tagsetadditional tag set for graphs, networks, and trees
Class
Filenameteinet2
Content: empty
Parentstree
Children[none]
Declaration
<!ELEMENT root          - O  EMPTY                              >
<!ATTLIST root               %a.global
          label              CDATA               #IMPLIED
          value              IDREF               #IMPLIED
          children           IDREFS              #IMPLIED
          ord                (Y | N)             #IMPLIED
          outDegree          NUMBER              #IMPLIED       >
See 21.2

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